http://www.pcgamer.com/the-next-overwatch-map-is-a-blizzard-theme-park/

Announced at Blizzcon 2017 today, the next Overwatch map is modeled after a fictional Blizzard theme park (for a second I thought a real Blizzard theme park was coming) called Blizzard World. 

It's a hybrid map—part assault, part payload—with World of Warcraft, Diablo, and StarCraft-themed areas. Blizzard World is coming next year, and to the PTR "very, very soon."